Make the sauce: Combine the ingredients and stir until well combined. Store covered in the refrigerator for at least one hour before using.

Cook the burgers: Season the meat with salt and pepper, making sure not to overwork the meat. Gently form the meat into six 7-ounce patties. Grill for 3 minutes on each side over medium high heat. Do not push down on the burgers as this will cause the juices to run out. Place a slice of cheese on top of the burgers and cook until melted.

Assemble the burgers: Remove from the grill and place a burger on each bottom bun. Top with the onion, bacon, tomato, and lettuce and a generous tablespoon of the BLT Burger Sauce. Top with the other half of the bun and serve immediately.